Garchomp is boss and unlike Excadrill it can also sweep outside of sand. However, in sand, it can sweep pretty much any team. With Sand Veil you can continously Sub on something like Ferrothorn until it misses, Swords Dance and Earthquake to KO and sweep. Outside of sand it becomes a simple Swords Dance sweeper with near-perfect STAB coverage, and Sub to prevent it from being revenge killed.

How about some Double Electric action? Team 2 has two Ground-types and both don't enjoy switching in on Hidden Power Ice or Focus Blast and adding another Ground-types is gonna cause some synergy issues for Team 2 so Thundurus is free to spam its powerful STAB Thunders. Zekrom and Thundurus can also work in conjuction by wearing down Electric resists and open up for one of them to sweep. The best way for Team 2 to handle Thundurus now is add Scarfers to revenge kill it (though Team 1 has to add a weather starter for Excadrill), and those are easy to switchin and we can easily add a counter for that, or better: something the Scarfer they've chosen on can't revenge so they'll have to add another Scarfer and have two weak Choice-locked mons.

I'd like to attempt to persuade my eager, budding, and undoubtedly intelligent Ubers players to really exert their logic circuits and their common sense mains. When playing this game take a moment to concern not only which Pokemon go where, but also the pick order.

Of course, I am convinced that the more cunning of you have recognized the value of picking later as opposed to earlier. Picking Pokemon that influence team style is generally a bad idea, weather summoners, Pokemon with hard counters, niche counters, I advise against picking all of these earlier. The reason being that you want to bait the opposing team into making the least good pick possible; showing your big guns at the start encourages counter picks to your strongest and most integral Pokemon, something you definitely do not want.

In the case of Hippowdon being an early pick, standard sand has trouble with a few Pokemon, and has an easy time with a lot of others. I could very well be a wily wormwood and shut my mouth until team 1's last pick and smack on a Fighting or Water Arceus, which sand teams are typically weak to. There are more options: I could use Jolly Balloon Excadrill, Choice Specs Kyogre, etc. Furthermore, now team 1 will never use Ho-Oh, a Pokemon sand teams typically have little trouble with.

The inflexibility and transparency of revealing full sets in addition to the Pokemon make this a different ballgame for the less astute. Pick discreetly, with the intention to bait, befoul, bludgeon, barf upon, and generally bring waste to the opposition.

Rayquaza is notoriously difficult to handle. This set truly exemplifies that fact, the only reliable switch in into this is defensive Heatran, but using that on a sand team against what is probably going to be rain is suicidal. Steel Arceus is probably your next best switch in, but takes a toasty offering from Fire Blast and restricts Arceus typing. Not to mention Kyogre beats Steel Arceus on most occasions.

Draco Meteor OHKOs Hippowdon, 2HKOs courageous Gastrodon, and pretty much slices a rather large chunk out of most Pokemon. Fire Blast actually packs a surprising amount of power, still OHKOing Specially Defensive Skarmory at -2. Outrage prevents Blissey and Chansey from walling this set and in conjunction with Dragon Dance can threaten a sweep if such an opportune moment presents itself.

This also forces a Choice Scarf user upon team 2, because Excadrill cannot revenge kill Rayquaza.

tl:dr version of poppy's post: Team 2 is fucked as they've revealed their team strat right from the start.

If you don't want to be outpicked you must try keep your options as wide as possible from the start. zekrom+ray+whatever will pretty much rape t2 by themselves as the ray pick forces a scarf chomp/palk which gives t1 a slot for a bulky set-upper like groudon/arceus.